Mercer County is in Great Lakes & Wilds Pennsylvania. Of the 67 counties in the Keystone State, 436,867-acre Mercer County ranks 33rd by size. The total value of almost 1,000 acres of farms recently listed for sale in Mercer County, Pennsylvania, was nearly $4 million. The average price of farms for sale in Mercer County was $313,464. Farms for sale in Mercer County sustain livestock including horses, cattle, sheep, pig and goats. Browse all Pennsylvania farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future commercial or lifestyle needs.